Dd age 15 is in a toxic relationship

[Holidaysyet]

And I don't know how handle it.

Firstly it is same sex, I really don't care that she's Gay and neither do any of the family.
Dd has additional needs which affect her maturity and became friends with this girl last year when the girl started the school. Up until this point dd had boyfriends but all her friends at her new school are gay and dd has come out as bi.

She is now in some kind of relationship with a girl.
The girl has various mental health, some quite severe and self harm issues and we had some issues with dd last year where she was encouraged by the girl to experiment with self harming. Luckily just a minor scratching but school were involved. There were also some issues with this girls suicidal comments.

For a while they weren't together but it's clear now they are in a relationship.
As soon as the relationship started dd has gone back to being awful at home, lying about where she is, lying about pointless things and a whole change in her behaviour.
The girl and dd seem to have some competitive thing going on of how much they hate their life, how much they hate their parents, how much they hate school.
There's been lots of talk from the girl on how there's no point going to lessons, they are just going to fail etc only my dd has and the other girl who doesn't have sen has pulled it out the exams.

Dd is besotted with her but the relationship is awful. Help!

Have you spoken to this girls parents?

No I don't know them. School isn't that local because of where we live and and the catchment area is large. Atm they don't see each other out of school due to this apart from the lies she has told about being in homework club.

My teenage DD was in a toxic relationship and all I could do was keep lines of communication open. I found it was counterproductive to argue about it or try and ban things -as I'm sure you have. Eventually I got a few breakthroughs by asking questions along the lines of 'and how does that make you feel when .... does ....'. It wasn't an easy time. Hoping some others have more advice.

Maybe being seperated over the summer holidays will be a good thing for her. At least she won't have the influence all day everyday.

sorry OP, they shouldn't be in a sexual relationship at that age. Your DD had boyfriends prior to this you are saying? How old was she when having these relationships? Is that with your blessing - you seem to be OK with it. Clearly, there are no boundaries at all, and they clearly can't handle it (surprise!) and its just all wrong.

Perhaps if you'd have shown her some boundaries?

The OP doesn't say it was a sexual relationship though?

Noisy what are you on about? It's perfectly normal for teenagers to have boyfriends and girlfriends

Noisy they weren't sexual relationships! She didn't even see them out of school bar one of them who came to our house a couple of times.
As I said dd has sen so until now it's been the type of relationship boys and girls have at primary school tbh where they ask each other to be boyfriend and girlfriend.

I have tons of boundaries in place due to her sen. As I said this girl hadn't even been to our house and dd hasn't been to hers.